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Acquisitions - Assets and Liabilities Acquired (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Apr. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill $ 753,718   $ 657,987 $ 650,237
Socrata, Inc.        
Business Acquisition [Line Items]        
Cash   $ 1,724    
Accounts receivable   3,616    
Other current assets   2,057    
Other noncurrent assets   68    
Deferred tax assets, net   20    
Identifiable intangible assets   75,000    
Goodwill   75,657    
Accounts payable   (1,254)    
Accrued expenses   (1,604)    
Deferred revenue   (5,915)    
Total consideration   $ 149,369